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Should Smoking Be Banned in Public Places ......

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Had I ______(听了你的建议的话), all this misery might have been avoided.
单项选择题
Why are the air fares predicted to rise dramatically
A．More and more people will take the plane.
B．No clean energy can replace the jet fuel.
C．Many airlines collapse due to carbon pricing.
D．The cost of an airline increases for finding new energy.
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